Luminus SST-40, a N4 BA bin tested

2x SST-40.
I bought them to dedome them basically. :smiley:
One will go in a modded Solarstorm SC01 (8x 7135) 14500 ‘mini thrower’.
The other one in an aspheric, probably my B158 on 4.5 Amperes CC FET driver.
I have a bunch of XP-G2 LEDs too, old and new, and a bunch of XM-L2, also some XP-E2.
Good to have the stuff in stock for future plans.

What is your plan of attack de-doming the SST’s?

The others will be easy….

I think i’ll put them in a small sealable container, room temperature, shake container gently a couple of times.
Periodically check how it progresses.

I don’t think there’s any need to pay the premium for reagent grade toluene, solvent grade should serve well enough IMO. I guess they want to ensure you’re not making bathtub TNT. :smiley:

Maybe, but this was the only thing i could find under € 20.— shipped.

Sorry, if I dont want to read the full thread.

Is it possible to dedome this LED with Nitro or other chemics?

With the low forward voltage, it would seem this should be a great led for regulated multi emitter lights. Its not a lot less watts, but over several emitters it adds up. Less heat, slightly more run time. Sounds good to me.

Hmm, if somebody made a mcpcb for these in a 20mm triple……… With a fet driver could be interesting as well if they push that much easier than xp-g3’s do.

After checking my Ali sst-40s I realized they are b grade, half have bubles in dome and some are not square but wider and centering dics not fit them.
KD is better place to buy, better bin, higher price though.

Were your LED’s mounted on mpcb’s? or were they bare. I’m still contemplating getting a few of these.

I think those shops on aliexpress did not sale bare leds only with mcpcb at least there were no bare leds where I bought them (SST-40).

Well, i bought 2 SST-40 form AliExpress, and i put them in pure toluene…

The first one got the chip detached from the 5050 base, it seems it wasn’t soldered on there properly…
So it died in the toluene, but i almost managed to reflow the chip back on the 5050 base, but something went wrong, it didn’t work anymore…
Interesting discovery though, because i think you could reflow the chip directly on to copper, and find a way to connect the bond wires to ‘something near by’, improving the thermal path from chip to whatever copper you want.
But i’m not buying them from AliExpress anymore.
It seems they are factory rejects.

The second survived the ordeal, it is dedomed now.
I will try warm or hot toluene, because there are still some bits of silicone on the phosphor, even after leaving it in toluene for some 36 hours…
But i was afraid the bonding between chip and phosphor would dissolve, like someone described happening earlier in this (or another) thread.
So i will try solving at higher temperatures with the 2nd SST-40, see if i can get it totally clean.

Meanwhile i have one from KD too.
I’m sure the chip will not fall of off that one… :person_facepalming:

I got 1 half way decent one out of like 30, decent that the bond wires didn’t break, but still, silicone remains are hanging off the bond wires. All of the SST-40’s I got came from Kaidomian. I have 20 SST-40 N4 AD’s coming 12 of which are going to replace the XML’s in my TR-J20, the rest, I’ll try a different approach.

I think I have read that having little silicon left on the bond wires is just good because it protects them.

Not if you can see it in the beam. :smiley: I think 18sixfifty has had some success, from what I gather, he slices and dices before chemical de-dome bath/soak.

The silicone dome has a heck of a hold on them bond wires. :rage: I have also had the chip coming off the pad on a few of them too! :person_facepalming:

Do post your build, I’ve got 2 of them and thought they needed a boost.

Boost it’s pulling 8 amps on a VTC5A, I thought I had something wrong at first, cause it would only pull 6+ amps, until i put a fully charged VTC5 and then a tried a VTC5A . I just swapped out the emitter/board in my M25C2 Turbo that had a FETDDdrv. in it. It’s a pretty intense BLUE-ISH spot, just kinda fuzzy and dark to one side, like casting a shadow from the silicone clinging on. Meh, I live with it, because I know what will happen! :person_facepalming:

Dales shaves them down to just above the phophorus and he’s getting like 9.4amps or more 2400-2600 lumens, something like that.

Maybe or could be, if they are weak, they might be damaged, I had a few that would light, go thru the levels a couple times and then burn out, some instantly and they still had the dome on, it was released from the base just not completely off, so I’m left wondering, was it the bond wires or was it the chip to the pad problem? Dunno?

you can see blown bond wires with magnification glass or macro function od a compact camera

Wow, even some of those from KD have badly solder flowed chips??
There’s no way the solvents cause the chips to fall off i.m.o.
On mine you could see it wasn’t soldered properly.

Whoa, that sounds like the KD ones are from a crappy batch too… :frowning:

Got my SST-40s from Shenzhen Great Technology Co.,Ltd, they appear legit. :+1: